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Is he still eating? Sounds like a mechanical injury - which will most likely heal on its own as long as it doesn't get a secondary infection. One of my tangs currently has a scrape on it (puffer?!) but it's healing a bit each day and the wound has stayed clean.
If the fish is otherwise behaving normally, I'd watch and wait, but watch for signs of aggression from other tankmates (who lives with him?) How long have you had the sailfin?
If he's eating, boost his food with some garlic to stimulate his appetite and his immune system.
HTH
Jenn
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Member of the "J" Crowd & the BRW Crowd!
LFS Owner: Imagine Ocean

Just keep skimming, just keep skimming, just keep skimming, skimming skimming! What do we do? We skim, skim, skim!
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